Power supply assembly



March 7, 1950 J. R. GELZER POWER SUPPLY ASSEMBLY Filed June 3, 1946 FIE- E JUHN PEQEEL ZEF? Fla- HI- Patented Mar. 7, 1950 fi itilgdiz POWER SUPPLY ASSEMBLY John R. .Gelzer, Jackson, Mich., assignor to Raytron, 'Inc., Jackson, Mich., a corporation of Michigan Application June 3, 1946, Serial N 0. 674,142

Claims.

The present invention relates to power supplies and more particularly to a compact unit containing sever-a1 power supply components.

Power supplies of the character to which the present invention relates consist of a vibrator for interrupting a direct current, a transformer for stepping up the direct current, a rectifying circuit, and filters for eliminating radio frequency components from the output current. A filter for smoothing the output direct current is also provided in association with the unit but is not included in the compact combination of components according to the present invention.

An object of the present invention is to include a transformer and vibrator unit in a casing, designed to minimize mechanical noise.

Another object of the invention is to provide a unit of the character described wherein the filter components are included in a casing with a vibrator anda transformer.

Still another object of the invention is to provide a compact power supply unit having one cavity for supporting a filter unit, another cavity for supporting avibrator-transformer unit, means for mounting the vibrator unit on the trans former, and means for shock-mounting the transformer.

These and other objects residing in the arrangement, combination and construction of the parts will be apparent from the following specification when taken with the accompanying drawings, in which Fig. 1 isa vertical section through a unit according to the present invention,

Fig. 2 is a bottom view ofthe structure shown in Fig. 1, v

Fig. 3 is a partial view showing a side elevation of the transformer-vibrator as shown in Fig. 1, and

Fig, 4 is a circuit diagram of the components comprising the units of Figs. 1 and 2.

Referring particularly to thedrawings, the reference character I indicates a housing which preferably is in the form of a deep-drawn can. Within the housing, adjacent the bottom thereof, is arranged an inverted cup 2, having a radially extending edge fiange3. Adjacent the lower edge of the can I is an inwardly extending bead 4 providing a shoulder 5. The ,flange 3 bears against the shoulder 5. Bearing against the flange 3 on the underside thereof is a bottom plate 6 from which securing tabs 6' are struck. An inwardly rolled bead I bears against the bottom plate 6 to hold it and the inverted cup 2 in assembled relation with respect to the can I.

Within the inverted cup 2 are disposed filter units 8 shown in dotted outline in Fig. l and in full outline in Fig. 2. The specific function of the filter units 8 and the other components within the can will be hereinafter described with reference to Fig. 3.

A transformer mounting plate ii is mounted on the bottom of the inverted cup 2 by shock mounts 42. The shock mounts I2 may be of any suitable character but as shown comprise grommets l2 having slots receiving the mounting plate I and secured to the bottom of the inverted cup 2 by bands I3.

A transformer l4 rests on the mounting plate I3 and is secured thereto by a saddle iii. The saddle E5 in its broad aspects is more particularly disclosed and described in my co-pending application Serial No. 674,141, filed June 3, 1946, and consists of aback Ifiand side legs ii. The saddle I5 is wrapped around three sides of the core 28 of the transformer I l as shown particularly in Figs. 1 and 3, and the legs Il thereof have underturned tabs 2| on the underside of the mounting plate. II. It will be clear that the saddle I5 rigidly secures transformer I l to the mounting plate II.

A vibrator 24 is provided with end boards 25, in each of whichv is a slot 26. Struck up tabs 2'1 on the back It of the saddle I5 extend through the slots 26 and are deflected downwardly as shown in Fig. .1 to mount the vibrator on the saddle I5 and thus the transformer I4. The vibrator mounting on the transformer I l by means of the saddle I5 is more particularly described in my aforesaid co-pending application.

The circuit diagram of the elements disclosed in Figs. 1 through 3 is shown in Fig. 4 and is similar to. the circuit diagram disclosed in my above identified co-pending application.

Referring particularly to Fig. l, the transformer I4 consists of a primary winding 39, and a secondary winding 3|. Associated with the transformer I4. is a reed 32 which is a part of the vibrator 24. The circuit for driving the reed con sists of a contact 33 for contacting the reed, a conductor 34, the electromagnet of the vibrator 24, a conductor 35, an R. F. choke 86, a switch 31 and a battery 38. Both the battery 38 and reed 32 are grounded to complete the circuit. The contact 33 is normally closed so that upon the closing of the switch 2? the circuit is completed through the battery 38 to cause the electromagnet ofthe vibrator 24 to draw the reed away from the contact 33 breaking the circuit.

Contacts 39 and 40 On opposite sides of the reed 32 are connected to opposite ends of the primary winding 3c of the transformer 14 so that as the reed 32 oscillates the current from the battery 38 is alternately directed in opposite directions from the center tap 4| to which the R. F.

' choke 36 is connected. At the same time, contacts 44 and 45 on opposite sides of the reed 32 are connected. to opposite ends of the secondary winding 3i to alternately direct induced current in the winding 3! outwardly through the output conductor 46 which is connected to the center tap of the secondary winding 3!. The other output conductor 41 is grounded so that the contacts 45 and 44 and their connection to the secondary (i! provide a direct current in the output terminals 49 and 47. The secondary winding 31 is shunted by a capacitor 48 for phasing the output current to minimize arcing at the contacts. The output conductor 46 has therein an R. F. choke 5!] and is grounded through a capacitor 51 to filter out R. F. components in the output. At the primary side of the transformer M, the R. F. choke 39 and a capacitor 52, between the center tap 4i and the reed 32, serve to filter out R. F. components in the battery circuit.

The R. F. chokes 36 and 59 and capacitors 5| and 52 comprise the filtering unit 8 disclosed in Figs. 1 and 2 and as pointed out above are housed in the inverted cup 2 of the assembly.

The entire unit, as mounted in the can I as shown particularly in Fig. 1 is virtually soundproof due to the small size of the vibrator 24 and the fact that it is rigidly secured to the relatively heavy transformer l4 so as to damp the vibrations of the vibrator 24. At the same said transformer so that the mass of the latter is utilized to damp the mechanical vibrations of the vibrator, and a container enclosing all of said parts, said shock mounting serving to absorb vibrations imparted to the vibrator-transformer assembly as a whole.

2. In combination, an inverted cup having a base, said cup comprising a housing, a base plate, shockmounting means mounting said base plate to the exterior of said cup base, means securing a transformer to said base plate, a vibrator mounted on said transformer securing means so that the mass of the transformer is utilized to absorb the vibrations of the vibrator, and a container enclosing all of said parts.

3. In combination, an inverted cup having a base, a base plate, means shockmounting said base plate on the. exterior of said cup base, a

time, the shock mounting of the transformer will also be required before the output current is suitable for use in radio receivers but such a filter is not a part of the present invention and would be supported outside of the can.

The arrangement as shown in Fig. 1 will result in substantially perfect shielding and filtering of I electrical disturbances, since there is provided a separate shielded filter compartment in the form of a cup 2 and mounting plate 6. This compartment prevents any coupling between the filter vibrator assembly, so that the efficiency of the filter elements is not diminished by said coupling. Furthermore, the currents flowing through the vibrator contacts, vibrator reed, and transformer primary are themselves contained in a separate shield compartment consisting of the can I and the cup 2 which completes the enclosure. The electric fields resulting from these currents is therefore contained within the enclosure and cannot radiate to circuits outside the can I, nor into the aforementioned filter compartment.

Having thus described my invention, what I desire to secure by Letters Patent and claim is: 1. In combination, an inverted cup having a base, a base plate, means shockmounting said base plate on the exterior of said cup base, a transformer mounted directly on said base plate, a vibrator, means mounting said vibrator on components mounted therein and the transformer mounted directly on said base plate, a vibrator, means mounting said vibrator directly on said transformer, said vibrator being adapted to interrupt a direct current power supply, said transformer being adapted to step up the voltage of said interrupted current and having its weight utilized to damp the mechanical vibrations of the vibrator, a filter for association with said transformer and vibrator, said filter being housed in said inverted cup, and a container enclosing all of said parts.

4. In combination, an inverted cup having a base, a base plate, means shockmounting said base plate on the exterior of said cup base, a transformer mounted directly on said base plate, a vibrator, means mounting said vibrator on said transformer so that the weight of the transformer is utilized to absorb the vibrations of the vibrator, an annular flange comprising a part of said cup, a container enclosing all of said parts, an annular shoulder about said container, said flange seating against said shoulder, and means to hold said flange against said shoulder for securing said cup with respect to said container.

5. In combination, a main base structure, a secondary base structure, a transformer mounted on the latter, means shock mounting said secondary base structure on said main base structure, a vibrator, means mounting said vibrator on said transformer so that the mass of the latter is utilized to damp the mechanical vibrations of the vibrator, and a container enclosing all of said parts, but in contact only with said main base structure, said shock mounting being adapted to absorb vibrations imparted to the vibrator-transformer assembly as a whole and preventing transmission of vibrations to the container.

JOHN R. GELZER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,708,678 Murphy Apr. 9, 192-9 1,747,937 Hopkins Feb. 18, 1930 2,021,380 Raskhodoff Nov. 19, 1935 2,141,369 Alexander Dec. 27, 1938 2,343,675 Kenyon Mar. 7, 1944 FOREIGN PATENTS Number Country Date 560,181 Great Britain Mar. 23, 1944 

